Step 1: Understanding the traditional approach.
In the 1930-1940 period, the traditional approach of financial management, which focused on conservative financial strategies, was replaced by more modern, risk-focused approaches.
Step 2: Analyzing the options.
(A) 1910 - 1920: Incorrect. The traditional approach was not discarded during this time.
(B) 1920 - 1930: Incorrect. The shift towards modern financial management occurred later.
(C) 1930 - 1940: Correct. This is when the traditional approach was replaced by modern financial management practices.
(D) 1940 - 1950: Incorrect. The transition had already occurred by this period.
Step 3: Conclusion.
The correct answer is (C) 1930 - 1940, as this was the time period when the traditional approach of financial management was discarded.